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Our Staff


Christiano Sosa

Executive Director

Christiano has been with The Arc of Colorado since 2018. Prior to joining The Arc of Colorado, Christiano was the Director of Capacity Building and Philanthropic Partnerships at The Denver Foundation, a position he held for twelve years. Prior to that, he was Executive Director of the Northern Colorado AIDS Project in Ft. Collins where he engaged extensively in public policy advocacy for men, women, and children living with HIV.
Christiano is a Colorado Trust Fellow and former Commissioner for the Denver Office of Strategic Partnerships. He has taught courses in "Wealth and Philanthropy", "Resource Development", and "The Student Oriented Field Experience" in the Masters of Nonprofit Management Program at Regis University.
He currently serves as President of the Board of Directors for Mi Casa Resource Center, advancing the economic success of Latino families in Denver.

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Heidi Haines

Director of Advocacy

Heidi Haines has been with The Arc of Colorado since 2011. Heidi works as the Director of Advocacy and also serves as an advisor to SABE, the National self advocacy organization for people with developmental disabilities.  Heidi is a 2017 graduate of the National Leadership Consortium on Developmental Disabilities at the University of Delaware Advanced Leadership Institute.  Heidi is also 2016 graduate of the William & Mary Law Institute of Special Education Advocacy.  Heidi served as a technology navigation fellow for The Arc of The United States in 2015 and 2016. Heidi has long demonstrated a passion for disability rights, an understanding of the critical issues and the desire to collaborate with a wide range of advocacy and community groups in the state of Colorado and nationwide. 

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Abigail Negley

Public Policy and Advocacy Coordinator

Abigail has been with the Arc of Colorado since 2017. She works on a variety of things in our office including communications, policy, and advocacy referrals. She was a volunteer with The Arc for six years during high school and college, prior to becoming an employee, and has developed a passion for advocating for individuals with Intellectual and Developmental Disabilities. Abigail strongly believes that sound, bi-partisan policy can make a positive difference in the lives of people with I/DD. She is a 2018 graduate of the University of Denver with a Bachelor of Arts in French and Francophone Studies and a Bachelor of Arts in Socio-Legal Studies. In her spare time, she enjoys reading philosophy and spending time with family. 

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Denver, CO 80203

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